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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71030fb2114538d80ea3f23529a627f009009d19d8dffe5bef20829a67ebdc41' 
  AND token = 'GcXv1yBsdy4bD9TpgdMwvas0+oeqlg78bJimeDzSx9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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