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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cefba1bbb9ad6abd80a1150a3e48dcc83f76eb5a707f7302bb1c4ff3c42cf6b2' 
  AND token = '84D8Fw5AuW0FhOnYPAqI/T2T4FfBdCQME5k6iSMK03I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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