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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '815643e009b598d1bde9ed189feaf198a83af0b7010892c07debaaab4e7ba0d4' 
  AND token = 'xabuIBOaFik83ov/dhWDsFHJi17PYXzN5iaPWI9j0g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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