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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b425c060794e01708ec36e65f1903f3c7c27b36f194ad1d347e988996fde3d5e' 
  AND token = 'JErsH5QzrDUOS8Q/5scBeMfTwhpBGcs6K3bw69yWRYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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