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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8ae0a72ff29e35dffdc162edf2dbf11b89a4e20f10dcc6a44d953316904557' 
  AND token = 'x3dsOgsHjf96VNPNlv813vy2pOTVlF7rEkhQw++qnEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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