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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1ed97f713cf79fc65930a673a4fac27ab9c0322d711517fc4d67876fc58f55e' 
  AND token = 'UJ0POGMmGvsoty+xtSQtAK5wb3DfVRQioirq8SVu6Ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}