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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8aae5ed9ca87fae857f0fbac4dc90f733526afbef941d65c44478104fb977e5' 
  AND token = '6orI4yyTnWCbwH+dirhPqlWi0MX2KC0BHKHd3Hq4SSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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