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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91abf329fe57517c7d0f7ee5d89915a8e1d896822343fabce5b243eaca6e48d' 
  AND token = 'z3RUD2Iq7i3DkSLhyzmoMpdYNIPMYevb9V1wP7gQRWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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