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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85550f4b99f6f0a067beeaa47f77ccd1837dff2f5ef31519b714569cdc59501a' 
  AND token = 'Zlm0SPgLOPuF5WdAARE7/AW6CjqUW5jMN/q34o8GvBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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