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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdf46edf7cb3217019405b119fd5dec2ac7f7562649512892d234fbb422be8c' 
  AND token = 'CpPUZreFvuREOu3l0OZh8+fNnGT8I9Ur96uAVPfuHS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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