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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eacf8fa102f4ecfd0922a64e4d1836bd5caad12b60b59cee80d94b20d074b0d5' 
  AND token = 's0bpFtrWhv5kOjrLO2oMpZZ90aRi63mFgutNZ2j/hBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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