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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62d92d1c30dfa61c24aef6a3c671e9d5eccffd8531d1bb0b7b39b70e91cdc01' 
  AND token = 'pd4EyRHo7cd1I39isXsXDl0eN6eBPSbfZMEgvugp8sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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