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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f349566d4e67fffe5a6bb699a066bcc6338c0331330f22c662ba423ef7a362e2' 
  AND token = 'Dxfod3eFR6t/wGk/wnNK0K9K3YeL4L13yV6FpfrmpUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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