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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c6d5615f3d4242f633cd6ff4e29b875142ccc105db7afa8a869e0e1d56b7d7' 
  AND token = '9FojmRx3n+9rG2pcN8c6ez2cOb9OG6TYxGRsdD8SCo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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