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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ae112411799850c174cfba0f56c50cf998a60dcef26cd6cebee0e5c13abdbd9' 
  AND token = 'j7zDhRTtY6NvnFYc3Fz11qmOJ5A08v0whw2gRlRR8fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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