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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313d77ed96f39794fdbccceaff7e417aa9490f61645c2cc3e7a13a21eb21a8ab' 
  AND token = 'wGz0HLR1oWrSfjXcxCqHQ8nf/XTku56mu5ep3E4R2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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