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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25ee612ff41ae8a31e7012880351da2c5375a48c5af5ccad61834c6fb891740' 
  AND token = 'Trgeculd5bKJSBi1SJLL5DNmcgDBb5VRwxv37O4sxhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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