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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7821920bea4bce36bc2a834c837294fe77355f99573627d241368ce5d9b205c' 
  AND token = 'FnaL3KrkIkQwmHC6RDre5IULu7ztY5BD8l0GZBS1hMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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