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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88bb0d90ae9eb7aa240457a852bb00d5a0407a71989ddbae4a65618820ccc697' 
  AND token = '3KihN2D0KEkmbqS0tnDTz5k3SbREdmiO7SEup/Fr/iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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