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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591463736f0129fcfd0fb00718e3145f9affba1c314786520a0b46e7fd8d4c70' 
  AND token = '5/mCz62W+4UcuKMUuE4AvVohM8gRTDbsNN/uFi2uHWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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