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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4726c7d329c866d4a3366c84e3ee87e58e2b30e1ab8a0bb71c1fdb73991c08' 
  AND token = 'hu9i6FuNtQB1Q2kVAiWNVpEdKye9kz25jYqjQgBeoY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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