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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74511fa5ea08edf59dc6b365780f23f65c135b860d241e5c5eba66cf75b926ae' 
  AND token = 'rIVgEIsv4ZdhGXFD6Ku2jf+4DFP8i1FO34kF6/OEVeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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