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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155b2e3122f4f754624d7fbfd17c496d9c140e516a0ff9c2c3b52a21c6554bda' 
  AND token = 'Ec+VH5KRL1XCLx6tIHVFF2ZVG432+J484UtkN99i1r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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