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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '766b5bcb5a48a061a27c576cf43827d2bd8d93702b408c9fb05ffe70d8c3a53b' 
  AND token = '1cr2fnG70qlaILFMPnIjYHJ3cT5/s4z/q7MGcbTlmNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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