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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a027c719fbc3a354224b29736ffd61f3667d8d072a2df151dc6421bfb1b0fada' 
  AND token = '7l6Uoui9wm78nlEmGi+hL8Y+1o5PnEE6gSBvEHG9ipE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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