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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3aca3f0fb42ab931a8501c7928f3ddfefdbd4c7f4e9a2c55266ac7c90697996' 
  AND token = 'liCCP4vKOY8vctPjkMU7d2mQd3+QSLBTM9LtPMYE5FU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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