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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '700b85df78c46f5d1c934168667b46eea1f2b4c10518cca8dbbe0242c3c2cdda' 
  AND token = 'jBV6bLlSToirDayivmjz4vNVKbBLXlDnkObsC/7gy6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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