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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d01d19bbabda5bf4e0a3ae4d0005853070bff104e16b0a1acff7f7ccdab9cf' 
  AND token = 'F8euq/ed+eYQ7ieqwdJvcQmbKnQ+br/dbhN5vnKkS84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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