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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74258c11e6f7658f7f6f022723414ea07f6efd1253e8b63214888fb80b699ca' 
  AND token = 'SDPaxKaHuMjxayeHObwhfR2O18+SxUsS9tDep+/Emiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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