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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97069d3cf4e4a2c25e8d5245c2c08b8c3a62e52313e132a8d26e9696e1a2035c' 
  AND token = 'dDSd0ZWpnBqknZc1RQvQEcOXHN3bE/H8RiSbSNz3/hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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