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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1979d69327304e63a2fe80be645eded6d0ae91809ecb01f349bd63ec207108f2' 
  AND token = '/K6D0kLQdDfiGdT4fThgv52QkItWfpb2+lp3ep/mzqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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