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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8e06e4517f39f8cdbd47b389e12ba27f2be8d90360e649c6edab7b1b24f936' 
  AND token = 'S0QC6GHQYS+kj9XCnNLpdXthyfMox+s95XwD1g0Iefg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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