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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff55b6aef4366056ec90e0a9458bddc731648faf982f2f663d117fd627675390' 
  AND token = 'r3AQ0KpE7kMqc0efCpC1CUTQS7Yzuam7GlhF0U2E3cg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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