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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b4b99d2a7a9dd8968e648a0e4111e2b8ab0e862d0a61610fa40677fabba5cfb' 
  AND token = 'mJuoluSIPMGshL9C3jtTR08BimEKLmmepg6cVA0B9LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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