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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac29cf482b2c9fe3373370092edfc59257814dab35b8a97ac751e379f33eb6a' 
  AND token = 'dF8c5OPYElg3o4n8S9QoK5Z3/Z+8vhDLerw+QiX5q3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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