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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b931b2bc8d3df65848792edf995b611bf0099ff366e66932ba2c394836416554' 
  AND token = 'BVrl9x0ERS29Fn2SS2Y94WU/Bswki8JljkMUndzCGQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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