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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '952fdbc54d6be6de04e7e8918503c0ede624fc7de2ac64d0e5d87d4298113022' 
  AND token = 'JUj5RTmz92e6rMuGwTSP4njZ3NOocRR4NV+gF7bP6Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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