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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ba9bd5fb78fabf183c99e6559d5e83f5a1f82e3c9dd9a253167ceea0894aef' 
  AND token = '/02gsfq9IB2gP5VgGEsxHTiqZh2w4v1llecQtJ2FspQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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