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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcb764a0000a6b9489591d456700fa2290180c113ed2ffcb80a17b2a917bf358' 
  AND token = '26U7GSGi+s1eqTs5TA9fe26jUWFzsxTA7tso+CncAV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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