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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de5771d32845f108eac7e4358c3d9d966c6428bd7e559694d3c7631a16db3cc6' 
  AND token = 'DIgKwlqxb/m8kJPXOIo4/y9t1adlhKnXLYdD+2Go6IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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