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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba1d65bbf2491ba0605081df50b11dd8f6adcf26734788341225be210e9cc8f' 
  AND token = 'jCRXps6e68q3p/8I5kJ9Bc4ezXTRbdHTmhe0kIj7Nps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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