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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca5383cb32678997d8f1c5b3c919c84c1e01095779d463f6f61df07d97fecdf5' 
  AND token = '/jeD+BG0eCO+xiO5n7Ewt/GDQL2bHQnMcg1dP/z2PBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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