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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade737e080ebefd515d94c6cc3ffe0824a074d9195c725a07ea88b24aef14471' 
  AND token = 'mfzfCprBwp+w6T1cX3MgRb2B5+3m1ew36FxnJQFN19g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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