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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a066a04b45df244415c6e29ff91ac44fec81c90d10c71286dcd705843bac9b4' 
  AND token = 'jwXXkdwmVHMRqPQM8KBQCzCDlh7zGGMmsmCxocOAX10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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