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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83b27b0b83755ff6d3cfa427a39b103f47dc2d75145cf7ddd62f4d86d33427d' 
  AND token = 'EhA/pd60wOROvEPDyRue0sv7CiNJwCIkBBGMfRB6aOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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