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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027bb0dee5d78507d83fdce93b7c70f28589f52da32cfafb29f2ae768850d1d2' 
  AND token = 'r1br3ERPHFqq+d8inPo8nGAAP/jmRIPcMcA7NqMLBRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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