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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ad2d4a7eea46730a3ada194b309e2c9598a0aa6c182ceba02e968e2a3107dd3' 
  AND token = 'lgFBlAMUqyHBwHGlKBIcod861Jy6pi1Y0Jds4uEReTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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